Cyclic arsenic and phosphorus compounds and methods of preparing same



United States Patent 3 094,545 CYCLIC ARSENIC AND PHOSPHORUS COM- POUNDS AND IVIETHODS 0F PREPARING SAME Richard P. Welcher, Old Greenwich, Gerald A. Johnson, Stamford, and Vernon P. Wystrach, Nor'oton Heights, Conm, assignors to American Cyauamid Company, New York, N.Y., a corporation of Maine N0 Drawing. Filed June 27, 1960, Ser. No. 38,697 33 Claims. (Cl. 260-440) The present invention relates to novel cyclic phosphoruscontaining and arsenic-containing organic compounds and methods of preparing same. More particularly, the instant discovery concerns the cyclization of bis(Z-cyanoethyl)alkyland bis(Z-cyanoethyl)aryl-phosplsines or arsines in the presence of catalysts to prepare the corresponding 4-amino l-alkyland 4-amino-1-aryl-1,2,5,6- tetrahydrophosphorin-3-carbonitriles and 1,2,5,6-tetrahydroarsenin-3-carbonitriles. The phosphorini-carbonitriles may in turn be reacted with water in the presence of an acid to provide the respective cyclic l-alkyland l-aryl-phosphoridinones.

The following generic equations teach, broadly, the instant discovery:

( NHi Catalyst (CNOH OHBMZ 0N (B) NH: 0

Mineral wherein Z in the formulae is phosphorus or arsenic and R is a member selected from the group consisting of alltyl C -C substituted and unsubstituted; aryl, substituted and unsubstituted; said substituents on the alkyl moiety being selected from the group consisting of hydroxy, lower alkoxy, amino, phenyl, pyridyl, fury] and thienyl; and said substituents on the aryl moiety being selected from the group consisting of lower alkyl and halogen.

The present invention, therefore, provides, quite surprisingly novel cyclic 4-amino-l-alkyland 4-amino-1- aryl-1,2,5,G-tetrahydrophosphorin-B-carbonitriles and 1, 2, 5,fi-tetrahydroarsenin-3-carbonitriles and cyclic l-alkyland l-aryl-phosphoridinones of high purity and in high yields in a straightforward manner.

As will be seen hereinafter, the phosphorus-containing intermediate products contemplated herein, i.e., the 1,2,5, G-tetrahydrophosphorin-3-carbonitriles, may be recovered prior to being reacted with water in the presence of an acid to produce the corresponding cyclic phosphoridinones. Alternatively, however, the intermediates may be treated in situ to yield their respective final phosphoridinone products. The advantages inherent in each of these processes will be apparent from the description infra.

"ice

Typical catalysts within the purview of the instant invention are alkali metal alkoxides, such as sodium t-butoxide, sodium isopropoxide, sodium ethoxide, potassium t-butoxide, potassium isopropoxide, and the like. Of these sodium t-butoxide is preferred. Other catalysts contemplated herein are finely dispersed alkali metals, such as sodium or potassium metal; sodium amide; metal derivatives of secondary alkylarylamiues.

Typical bis(Z-cyanoethyl)alkylphosphine, bis(2-cyanoethyl)alkylarsine, bis(2-cyanoethyl)arylphosphine and bis(Z-cyanoethyl)arylarsine reactants are:

bis( 2-cyan oethyl )ethylphosphine;

bis Z-cyanoethyl octylphosphine;

bis Z-cyanoethyl) -3 -eicosylphosphine;

bis Z-cyanoethyl) 1 3'-aminopropyl phosphine; his Z-cyano ethyl) 3 hydroxypropylphosphine; bis Z-cyanoethyl -2rnethoxyethylph osphine;

bis (Z-cyanoethyl -2-( 2'-thienyl ethylphosphine; bis 2-cyanoethyl -2- 2-pyridyl )ethylph osphiue; bis (Z-cyanoethyl phenylphosphi ne;

bis Z-cyanoethyl tolylphosphine; bis(Z-cyanoethyl) -1- (trimethylphenyUphosphine; bis 2 cyanoethyl l-chlorophenylp-ho sphine;

bis 2-cyanoethyl methylarsine;

bis (2-cyanoe thyl ethylarsine bis(Z-cyanoethyl propylarsine;

bis Z-cyanoethyl) amylarsine;

bis( Z-cyanoethyl) octylarsine;

bis (Z-cyanoetbyl) dodecylarsine bis (2-cy anoe thyl hexade cylars'me;

bis( Z-cy anoethyl eicosylarsine;

bis Z-cyanoethyl -3-aminoprop ylarsine;

bis( 2-cyanoethyl -3 -hydroxypropylarsine;

bis (Lcyanoe thyl -2-methoxyethylarsine;

bis (Z-cyanoethyl -2-( 2-thienyl ethyl arsine;

bis Z-cyanoethyl) -2-(2.'-pyridyl ethyl arsine; bis 2-cyanoethyl )phe nylarsine;

bis( Z-cyanoethyl) tolylarsine;

bis 2-cyanoethyl benzylarsine;

bis (Z-cyanoethyl) -2'-methylphenylarsine;

bis Z-cyanoethyl) -4-methylphenylarsine;

bis Z-cyanoethyl) -4'-aminophenylarsine;

bis Z-cyanoethyl) -4-hydroxyphenylarsine;

and the like.

The arsine reactants are prepared essentially as shown in Journal of Chemical Society (1949), 67, page 69 and Journal of Chemical Society (1947) page 621 by reacting the corresponding alkyl arsine or aryl arsine with vinyl cyanide.

Their cor-responding cyclization products are: 4-amino-l,2,5,G-tetrahydro-l-ethylphosphorin- 3-carbonitrile; 4-amino-1,2,5,6tetrahyd.ro-1-octylphosphorin-3- carbonitrile; 4-amiuo-l ,2,5 ,6-tetrahydro- 1 -eic osplphosphoriw 3-carbonitrile; 4-amino-1,2,5,6-tetrahydro-l-(3'-hydroxypropyl)phosphorin-icarbonitrile; 4-amino-l,2,5,6 tetrahydro-1-(2'-methoxyethyl)phosphorin-3-carbonitrile; 4-amino-l,2,5,6-tetrahydrol-l-(3'-aminopropyl)phosphorin-S-carbonitrile;

9 u 4-amino-l ,2,5, 6-tetrahydro- 1 [2- 2"-pyridyl) ethyl] phosphorin-3-car bonitrile; 4-amino- 1 ,2,5 6-tetrahydro- 1 [2'- 2"-thienyl ethyl] phosphorin-3-carbonitrile; 4-amino-1,2,5,6-tetrahydro-1-phenylphosphorin-3- carboni-trile; 4-amino-1,2,5,6-tetrahydro-l-tolylphosphorin-3- carbonitrile; 4-amino-l,2,S,6-tetrahydro-1-(trimethylphenyl)phosphorin-3-carbonitrile 4-aminol ,2,5 ,6-tetrahydrol chlorophenyl phosphorin-B-carbonitrile; 4'amino-1,2,5,6-tetrahydro-l-methylarsenin-3-carbonitrile; 4aminol ,2,5,6-tetra-hydro-l-ethylarsenin-3-carbonitrile; 4-amino-1,2,5,6-tetrahydro-l-propylarsenin-3-carbonitrile; 4-amino-1,2,5,6-tetr-ahydro l-amylarsenin-3 -carbo' nitrile; 4-amino-1,2,5,6-tetrahydro-1-octy1arsenin-3-earbonitrile; 4-amino-1,2,5,6-tetrahydro-l-dodecylarsenin-3 carb on itri le 4-aminol ,2,5 ,G-tetrahydrol-hexadecylarsenin-Itcarbonitrile; 4-amino- 1,2,5 ,6-tetrahydro-1-eicosylarsenin-3- carbonitrile 4-amino-1,2,5 ,6-tetrahydro-l 3 '-aminopropyl) arsenin-3-carboni-trile; 4-amino-1,2,5,6-tetrahydrol- 3'-hydroxypropyl)-arsenin-3 -ca rb on itrile; 4-amino-l,2,5,6-tetrahydro-1-(2-methoxymethyl) arsenin-B-c arbonitri 1e; 4-amino-l,2,5,6-tetrahydro-1-[2'-(2"-thienyl) ethyl] arsenin-3-carbonitrile; 4-aminol ,2,5,6-tetrahydrol- 2-(2"-pyridyl) ethyl] arsenin-3 carbonitrile; 4-amino-1 ,2,5 ,6-tetrahydro-l-phenyharsenin- B-carbonitrile; 4-amino-l ,2,5,6-tetrahydrol-tolylarsenin-3 -carbonitrile; 4'-am|ino 1,Z,5,6-tetrahYdr-l-benzylarsenin-3-oarbonitrile; 4-amino-1,2,5,6-tetrahydro-2'-methylphenylarseuiu- 3-carbonitrile; 4-amino-1,2,5,6-tetrahydro-4'-methylphenylarsenin- S-carbonitrile; 4'-arnino-1 ,2,5,6-te tr ahydro-4-aminophenylarse nin- S-carbonitrile; 4-amino-l ,2,5,6-tetrahydro -4'-hydroxyphenylars enin- 3-carbonitrile; and the like.

The alkylor aryl-phosphorin-3-carbo-nitrile cyclization products, in turn, upon reaction with water according to the process taught herein, yield the following products:

1-ethyl-4-phosphoridinone; l-octyl-4-phosphoridinone 1-eicosyl-4-phosphoridinone;

1-( 3 '-hydroxypropyl) -4-phosphoridinone; 1-( 3 '-aminopropyl) -4-phosphoridinone; 1-(2'-methoxyetbyl) -4-.phosph oridinone; 1-[2'-(2"-pyridyl ethyl] -4-phosphoridinone; l- [2- (2'-thienyl) ethyl] -4-phosphoridinone; l-phenyl-4-phosphoridinone;

1 (trime thylphenyl -4-phosphoridinone; l-chJorophenyl-4-phosphoridinone;

and the like.

Generally, the first step of the reaction contemplated herein, i.e., cyclization of bis(2-cyanoethyl)alkylor bis(2-eyanoethyl)arylphosphine or arsine is carried out in the presence of a solvent in which the dinitrile reactant and catalyst or condensing agent are soluble and inert. Preferably, an alcohol corresponding to the alkoxide catalyst is used. Aromatic hydrocarbons, such as benzene, toluene, and the like, are also contemplated, as well as ethers of ethylene glycol, others of diethylene glycol, diox ane, and other similar others. In other words, organic solvents which are typical are those substantially inert with respect to the dinitrile reactant, the catalyst and the cyclization product under the conditions of the reaction.

While the cyclization step of the process of the present invention is readily carried out at ambient temperature (20 C.-25 C.), temperatures in the range of 15 C. to 140 C., preferably C. to 120 (3., may be employed. Usually temperatures in the vicinity of the boiling point of the solvent are employed, since it is very often desirable to place the reaction mixture under reflux.

While atmospheric pressure is preferred for the cyclization step, super-atmospheric or Subatmospheric pressures are contemplated. I

The dinitrile reactantrcatalyst molar ratio employed is usually about 1:1; however, an excess of the molar amount of either component with respect to the other may be employed without a deleterious elfect being experienced. Undue excesses, however, tend to be cumbersome and impractical.

It has been found that the nitrile is best added to the base catalyst to provide but a relatively small concentration of nitrile at any time during the reaction, i.e., an excess of catalyst is desirable throughout substantially all of the reaction. While it is not intended that the invention be restricted to any particular theory, it is believed that a small concentration of dinitrile maximizes intramolecular reaction which gives the desired cyclic product and minimizes intermolecular reactions which would tend to occasion undesirable polymeric products. In addition, the excess base catalyst lessens side reactions between cyclic product and uncyclized dinitrile.

The aminoand cyanosubstituted phosphorin-Ii-carbonitrile cyclization intermediate contemplated herein is readily converted to its corresponding phosphoridinone by reaction with water in the presence of a mineral acid. Typical acids within the purview of the instant discovery are HCl, HBr, HI, H PO and other like non-oxidizing strong acids, i.e., acids which under the conditions of the reaction do not oxidize the intermediates and/or final products. This step of the process may be carried out in situ, as indicated hcreinabove, by merely adding water and a mineral acid to the unseparated cyclization product and heating to a temperature in the range of 25 C.- 0, usually at about 110 C., the reflux temperature of the Water under the conditions contemplated. Alternatively, the cyclization product may be recovered and subsequently treated as just suggested.

As in the case of the step described hereinabove for producing the intermediate, super-atmospheric or subatmospheric pressures may be employed. If super-atmospheric pressures are employed, correspondingly higher reflux temperatures are generally indicated.

Depending upon the reaction conditions, such as pressure, temperature, and the like, and the intermediate employed as reactant, reaction times on the order of 1 to 25 hours or more are contemplated. Generally, however, 5 to 20 hours are adequate; and usually some reaction begins in less than one hour.

The sequence of addition in this step is inconsequential and no solvent need be employed.

According to a preferred embodiment, the phosphorus or arsenic cyclization intermediate as formed in the first step is usually an alkali metal salt from which the desired cyclic product is liberated, if desired, 'by treatment with water at room temperature, extraction with organic solvent, drying and removal of solvent. To obtain the phosphoridinone final product from the phosphorus-containing intermediate treatment with water and acid at elevated temperature is best suited.

fioxypropyl phosphine, dissolved in EXAMPLE I 4-Amin0-1,2, 5,6:T elruhydrol -Ethylphsphorin- 3-Car bonitrile A solution of 42: grams (0.25 mole) of bisQ-cyanoethyl) ethylphosphine in milliliters of dry toluene is added dropwise to a stirred suspension of sodium tertiary-butoxide prepared from 6.0 grams (0.29 mole) of sodium metal and excess dry tertiary-butyl alcohol in *150 milliliters of dry toluene. The mixture is refluxed during the 2.5 hour addition, and for 1 hour more. A nitrogen atmosphere is used. The cool mixture is admixed with 50 milliliters of water and extracted with chloroform. From the dry chloroform extract is obtained 35 of crystalline solid which melts at 68 C.71 C. Recrystallization from aqueous alcohol followed by chromatographic purification gives white crystals, melting point 74.5 C.-75 C.

AnaIysis.-Calculated for PN C H C, 57.13; H, 7.79; P, 18.42; N, 16.66; molecular weight, 168. Found: C,

' 57.14; H, 7.80; P, 18.49; N, 16.60; molecular weight, 163. 7 Infrared and ultraviolet spectra confirm the identity of the product as 4-amino-l,2,5,6-tetrahydro-1-ethylphosphorin-3-carbonitril EXAMPLE II I -Ethyl-4-Ph osph oridr'none A solution of 15.9 grams (0.094 mole) of 4-amino- '1,2,5,6-tetrahydro-l-ethylphosphorin-3-carbonitrile (produced as in Example I, above) in 75 milliliters (0.40 mole) of 6 normal hydrochloric acid is refluxed for 6 hours. Additional acid is added and the refluxing continued hours. The solution is taken to dryness at reduced pressure. The residue is treated with 7.2 grams (0.18 mole) of sodium hydroxide and extracted with ether. The dry ether extract is distilled to give a water-White liquid boiling at 83 C.-85 C, at 1 millimeter mercury pressure. The product is 1-ethyl-4-oxophosphoridin.

EXAMPLE III {a} 4-Aminc-1,2,5,6-Terrahydro-I-OctyIphOsphorinf 3-Carb0nitrile I (b) 1-Octyl-4-Plrosphoridinone 15.1 grams (0.060 mole) of bis(2-cyanoethyl)octylphosphiue dissolved in 50 milliliters of isl adiieeLdropwise to a refluxing solution of 1.6 grams (lit)? mole) of sodium in 50 milliliters of isopropyl alcohol over a period of 1.9 hours. After an additional 0.7 hour of reflux the mixture is wor 'ed up as before to give 1213 grams of syrupy crystalline weight of theory yield). Without further purification the solid product (a) 4-arnino-l,2,5,6-tetrahydro-l-octylphosphorin-3-carbonitrile is treated by refluxing for 15 hours with 160 milliliters of 6 normal I-ICI to give EXAMPLE IV if 1-(3'-Hydr0xy ro yl)ffl osghoridinone twenty grams (0.10 mole) of bis(2-cyanoethyl)-3-hymilliliters of tertiary-butyl alcohol, is added to a hot solution of excess sodium tertiary-butoxide in 150 milliliters of tertiaryrefluxing, cooling and the addition of water. Ten grams of 4-amino-l,2,5,6- tetrahydro- 1 3 -hydroxypropyl phosphorin-3-carbonitrile is recovered.

This material is refluxed for 15 hours with excess 6 normal hydrochloric acid and l-(3-hydroxypropyl)-4- phosphoridinone recovered.

isopropyl alcohol solid (83 percent by ch-loric acid under reflux.

6 EXAMPLE v (a) 4-Amin0-I,2,5,6-Tetrahydr0-1-(2'-Meth0xyethyl) Ph sphorin-3-Carbomtrile (b) 1-(2-Merh0xyethyl)-4-Ph0sphoridinone EXAMPLE VI Example III is repeated in every essential respect using, however, bis(2'-cyanoethyl)eicosyl phosphine which cyclizes to 4-amino-l,2,5,6-tetrahydro-l-eicosylphosphorin- 3carbonitrile. The latter then yields l-eicosyl-4-phosphoridinone.

EXAMPLE VII Example III is repeated in every essential respect using, however, S-andnopropyl bis(2-cyanoethyl) phosphine which cyclizes to 4-arnino-l,2,5,6-tetrahydro-1-(3-aminopropyl)phosphorin-S-carbonitrile which, in turn, gives 1- 3 -aminopropyl) -4-phosphoridinone.

EXAMPLE VIII (:1) 4-Amin0-1,2,5,6-Tetralzydro-I-[2'-(2"- Pyridyl) Ethyl] Ph0splzorin-3-Carbonitrile EXAMPLE IX Example IH is repeated in every essential respect using, however, hisQ-cyanoethyl)-2-[2'-thieny1] ethylphosphine which is' refluxed with excess sodium tertiarybutoxide in tertiarybutyl alcohol and yields 4-amino- 1,2,5,6 tetrahydro 2 [2' thienyljethylphosphorin 3- carbonitrile which, in turn, yields l-[2'-(2"-thienyl)ethyl1-4-phosphoridinone when reacted with 6 normal hydro- EXAMPLE X (a) 4-A mine-1,2,5,6-Tetrahydro-I-Phenylphosplrorin 3-Carbonitrile b 1 -Phenyf-i-Plwsphoridinone To a slurry of sodium tertiary-butoxide, prepared from 2.9 grams (0.126 mole) of sodium metal and tertiarybutyl alcohol, wise over a period of 2 hours a solution of 15.5 grams (0.072 mole of -bis(2-cyanoethyl) phenylphosphine in 20 milliliters of toluen A precipitate appears during of re gge aslurry and the precipitate rides iiito give 12.4 grams of 4-amino-l,2,5,6- tetrahydro 1 phenylphosphorin 3 carbonitrile, melting point 0-138 C. The material is then treated for 10 hour iu refluxing 6 normal hydrochloric acid to yield 1-pheiiyl 4 phosphoridinone, melting point 43 C.-

'EXAMPLE XI Example X 7 EXAMPLE XII Example X is repeated in every essential respect using, however, "bis(2-cyanoethyl)trimethylphenylphosphine to yield 4-amino-1,2,5,6-tetrahydro-l-(trimethylphenyl)- phosphorin-3-carbonitrile. Treatment of this material with 6 normal HCl gives 1-(trimethylphenyl)-4-phosphoridinone.

EXAMPLE XIII EXAMPLE XIV 4-Amino-I ,2,5 ,6-Tetrahydr-1 -Phenylarscnin- 3-Carb0nitrile To a refluxing slurry of sodium tertiary-butoxide in tertiary butyl alcohol, prepared from 2.3 grams (0.10 mole) of sodium metal and 110 milliliters of dry tertiarybutyl alcohol is added dropwise 17.3 grams (0.0664 mole) of bis(24cyanoethyl)phenylarsine over a period of 1.3 hours. Refluxing is continued for 2 hours. The slurry is then cooled to 20 C. and hydrolyzed with 20 milliliters of water. The mixture is dried and stripped of solvent to give 13.8 grams (80 percent yield) of an orange syrup whose infrared spectrum shows it to be 4-atninol,2,5,6-tetnahydro-l-phenylarsenin-3-carbonitrile without any starting material left. A small portion is analyzed, after further purification by chromatography on alumina followed by recrystallization. Melting point 65 C.-67 C. Calculated for C H N As: C, 55.40; H, 5.04; N, 10.77; As, 28.20; molecular weight, 260. Found: C, 55.40; H, 5.04; N, 10.58; As, 28.70; molecular weight 277. Infrared bands at 3480, 3380, 2180, 1643 and 1605 cmf EXAMPLES XV-XXVI The following examples are carried out essentially as in Example XIV, above, yet using the reactants and conditions given in the table:

Table I M01 Ratio, Tem- Example Reaetant Catalyst Rcactsnt: perature, Solvent Pr d t Catalyst C. v (z c smeth i)- sodiumtertiary-butoxide.- 1:1 reflux.-. toluene d-amino-l,2,5,6tetrahydro-1- methylarslne. methylarsenin-B-carbonitrile. XVI bis(2-cyanoethyl)- sodium isopropoxide 1:1 do isopropylaleohol 4-amino-1,2,5,6-tetrahydro-lamylarsine. umylarsenin-El-carhonitrile. XVIIU. bistloyanoethyhsodium tertiary-butoxide 111.5 -do tertlary-butyl aleohol 4-an1mo-1,2,5,6-tetrahydro-idodecylarsine. diltdtifyltlrsenin-fi-enrbo- El 1 0. v11 bi(2-cyanoothyl)- sodium e hoxldo 1.521 d0 e hyl alcohol 4-am1no-1,2,5,6-tetm1i m-1- hexadeeylarsine. heculdeeylarsenln-acarbo- I1 I18. XIX bis(2-cyanoethyl)-2- potassium tertiary u- 1:2 "110.--. enzene 4-an1ino-l,2,5,6'tetrahydro-1- methoxyethylarsine. toxlde. (2"methoxycthyl) arseuin-3- earbonitrile. XX bis(2-cyanoethyl)-2-(Z'- sodium tertiary butoxide 1:1 do tertiary butyl alcohol"- Lamina-1,2,5,fi-tetrabydro-1- thlenybethylarsino. [2-(2"-thienyl)etliy1] 3T$8Illfl 3-C&fb0llltllll3. XXI bis(2-cyanoethyl)benzylpotassrumlsopropoxldc... 1:1 do lsopropylaleohol 4arnino-1,2,5,(Hetrahydro-larsine. I benzylarsentn-3-carbouitrile. 1 bi (2-cyan00t,hy1)- sodium tertrary-butoxide. 1:1 do dtox ne 4-amino-1,2,5,6-tetrahydro-1- phenylarsiuo. pheuylarsenin-3 carbontrile X11I bis ae anoeth l)-2 .d0 1:2 ..d0-. t lue 4-an1lnol,2,5,6-tetrahydro-l methylphcnylarsme. (2rnethylphenyl)arsenin carbouitrile. XXIV bis(2 cyanoethyl)-4- do 1:2 "110.... tertmry-bu yl alcohol--. 4-arnin0-L2,5,6-tetrahydro-1- methylphenylarsine. (4'-methylpher1yl)arsenin-3 earbonitrila. XXV bls(2-c-yan0ethyl)-4- dO 111 0. (1 4-amlno-l,2,5.otetrahydro-1- aminophenylarsine. (4'amm0phenyl)arsenjn-3- carbonltrile. XXVI b1s(2-cyanoetl1yl)-4- do 1:1 .--t xylene 4-amino-l,2,5,6-totrahydro-1- hydroxyphenylarslne. (4'-hydroxyphenyl)arsenln- 10 dropwise to the solution.

8 EXAMPLE xxvn 4 Amino-I,2,5,6-Tetrahydro-I-Metlzylphosphorin- 3-Carb0nitrile LiAlI-L; is added slowly under nitrogen to diethyl ether, the solvent, until dissolved. The phosphine diluted with 30 milliliters of Et O is added dropwise for 55 minutes. Exotherm results. The grey reaction mixture is refluxed (36 C.) for 22 hours. Thirty percent NaOH is added The temperature is kept at 10 C.l5 C. with an ice bath. Two layers form. The top-ether layer is decanted and solvent distilled off at reduced pressure. White product solid results which is washed with benzene and dried in a vacuum desiccator.

The product is 4-amino-l,2,5,6-tetrahydro-l-methylphosphorin 3-carbonitrile.

EXAMPLE XXVIII The process of Example XXVII is repeated in every essential respect with the exception that the catalyst LiAlHq is replaced by sodium hydride. is recovered.

The same product EXAMPLE XXIX The process of Example XXVII is repeated in every essential respect with the exception that the catalyst LiAlH is replaced by calcium hydride. net is recovered.

The same prod- EXAMPLE XXX lithium alummurn hydride, potassium borohydride, and

the like.

The cyclic 1-substituted-4-phosphoridinones of the present invention have direct utility as gasoline additives. For example, up to about 10 milliliters of a mixture of any one of these phosphoridinones added to one gallon E-earbonitrile.

of gasoline afiords protection against misfiring, surface ignition, and the like. 7 1

The bis(2-cyanoethyl)alkyland bis(2-cyanoethyl)- arylarsine derivatives, 'i.e, ;the Aamino-l-alkyl and 4 amino-l-aryl-1,2,5,6-tetrahydrgareenin-3-carbonitriles, of the present invention inhibit the growth of typical fungi and bacteria as shown in the following table, the concentrations of the compounds contemplated herein being expressed as the minimal inhibitory concentrations (in micrograms) per milliliter of nutrient media:

Table II ANTIFUNGAL ACTIVITY 4-amlno-1,2 5,6-tetrahydrod-phenylnr- I By 1 or less is meant that 1 mierogram per milliliter inhibits growth and that no minimal value below 1 is given.

The minimal inhibitory concentrations given in table II, above, are determined in a standard manner by the agar dilution streak technique which is well known and commonly used in testing new antibiotics.

While the results from but one typical compound are given in table II, it must be understood that the remainder of the arsenin" product compounds contemplated herein give varying degrees of activity against the test organisms reported in the table and similar other such test organisms.

Clearly, the instant discovery encompasses numerous modifications within the skill of the art. Consequently, while the present invention has been described in detail with respect to specific embodiments thereof, it is not intended that. these details be construed as limitations upon the scope of the invention, except insofar as they appear in the appended claims.

The instant application is a continuation-in-part of US. Serial No. 20,257, filed April 6, 1960 and now abandoned.

We claim:

1. A cyclic phosphoridinone conforming to the formula i ii wherein R in the formula is a member. selected from the group consisting of alkyl (I -C substituted and unsubititutedjphenyl, substituted andunsubstituted; said subiituents on the alkyl moiety. being selected from the group consistingof hydroxy, lower allgoxy, amino, pyridyl, furyl, thienyl and phenyl; and said substituents on the 10 V 7. A 4-arnino-1,2,5,G-tetrahydnml-substituted phosphorinaIi-carbonitrile corresponding to the formula wherein R in the formula is a member-selected from the group consisting of alkyl C -C substituted and unsubstituted; phenyl, substituted and unsubstituted; said substituents on the alkyl moiety being selected from the group consisting of hydroxy, lower alkoxy, amino, pyridyl, furyl, thienyl and phenyl; and said substituents on the phenyl moiety being selected from the group consisting of lower alkyl and halogen.

8. 4-amino-1,2,5,6-tetrahydro-l ethylphosphorin-il-carbonitrile.

9. 4amino-1,2,5,6-tetrahydro 1 (3' hydroxypropyl) phosphorin-3-carbonitrile.

10. 4 amino-l,2,5,6 tetrahydro-1-(3'-aminopropyl) phosphorin-El-carbonitrile.

1 l. 4-amino-1,2,5,6-tetrahydro-l-[2-(2"-pyri-dyl)ethyl] phosphorin-B-cttrbdnitrile. V

12. 4-amino-1,2,5,6-tctrahydroai-phenylphosphorin 3- carbonitrile.

13. A method of cyclizing a bis(2-cyanoethyl) substituted phosphine corresponding to the formula V onoinom r wherein R in the formula is a member selected from the group consisting of alkyl C -C substituted and unsubstituted; phenyl, substituted and unsubstituted; said substitucnts on the alkyl moiety being selected from the group consisting of hydroxy, lower alkoxy amino, pyridyl, furyl, thienyl and phenyl; and said substituents on the phenyl moiety being selected from thegroup consisting of lower alkyl and halogen; which comprises subjecting said phosphine in the presence of an alkali metal alkoxide and an inert organic solvent to a temperature in the range of 15 C. to 140 (3., said phosphine reactant being added to the base catalyst.

14. The process of claim 13 in which the temperature is in the range of C. to C.

15. The process of claim 13 in which the phosphine reactant is added to the base catalyst at a rate suflicient to provide but a relatively small concentration of uncyclized dinitrile reactant throughout substantially all of the reaction.

16. A method which comprises reacting with water in the presence of a mineral acid a 4-amino-l,2,5,6-tetrahydro-l-substituted phosphorin-3-carbonitrile of the formula to produce the corresponding cyclic i-substituted phosphoridinone corresponding to the formula wherein in the formulae is a member selected from the group consisting of alkyl C -C substituted and unsubstituted; phenyl, substituted and unsubstituted; said substituents on the alkyl moiety being selected from the group consisting of hydroxy, lower alkoxy, amino, pyridyl, furyl, thienyl and phenyl; and said substituents on the phenyl moiety being selected from the group consisting of lower alkyl and halogen.

17. The process of claim 16 wherein the carbonitrile- Water reactants are heated to a temperature in the range of 25 C. to 110 C.

18. The process of claim 16 wherein the carbonitrilewater reactants are heated to a temperature of about 110 C.

19. The process of claim 16 wherein the mineral acid is a non-oxidizing strong acid which under the conditions of the reaction does not oxidize the carbonitrile reactant and the phosphoridinone product.

20. The process of claim 16 wherein the reactant is 4- amino-l,2,5,6-tetrahydro-l-ethylphosphorin 3 carbonitrile and the product is 1-ethyl-4-phosphoridinone.

21. The process of claim 16 wherein the reactant is 4- amino 1,2,5,6 tetrahydro-l-(3'-hydroxypropyl)phosphorin-B-carbonitrile and the product is l-(3'-hydroxypropyl) -4-phosphoridinone.

22. The process of claim 16 wherein the reactant is 4- amino 1,2,5,6 tetrahydro -1- (3'-aminopropyl)phosphorin-S-carbonitrile and the product is l-(3'-aminopropyl) -4-phosphoridinone.

23. The process of claim 16 wherein the reactant is 4- amino 1,2,5,6 tetrahydro 1 [2-(2"-pyridyl)ethyl]- phosphorin-3-carbonitrile and the product is l-[2'-(2"- pyridyl ethyl] -4-phosphoridinone.

24. The process of claim 16 wherein the reactant is 4- amino 1,2,5,6 tetrahydro-1-phenylphosphorin-3-carbonitrile and the product is l-phenyl-4-phosphoridinone.

25. A method of preparing a cyclic l-substituted phosphoridinone which comprises a cyclizing a bis(2-cyanoethyl) substituted phosphine of the formula (CNC 1120112? R in the presence of an alkali metal alkoxide catalyst, at a temperature in the range of C. to 140 C. and in the presence of an inert organic solvent, to produce the corresponding 4 amino 1,2,5,6 tetrahydrosubstituted phosphorin-3-carbonitrile of the formula and, without recovering said carbonitrile, reacting same with water in the presence of a mineral acid and at a temperature in the range of C. to 110 C. to produce the corresponding cyclic phosphoridinone of the formula R in each of the above formulae being a member selected from the group consisting of alkyl C 43 substituted and unsubstituted; phenyl, substituted and unsubstituted;

said substituents on the alkyl moiety being selected from the group consisting of hydroxy, lower alkoxy, amino, pyridyl, furyl, thienyl and phenyl; and said substituents on the phenyl moiety being selected from the group consisting of lower alkyl and halogen.

26. A novel cyclic compound selected from the group consisting of 4 amino 1,2,5 ,6-tetrahydro-1-substituted phosphorin-3-carbonitrile and 4-amino-1,2,5,6-tetrahydrol-substituted arsenin-3-carbonitrile corresponding to the formula Jcrr wherein Z is a member selected from the group consisting of phosphorus and arsenic and R is a member selected from the group consisting of alkyl C -C substituted and unsubstituted; phenyl, substituted and unsubstituted; said substituents on the alkyl moiety being selected from the group consisting of hydroxy, lower alkoxy, amino, phenyl, pyridyl, furyl and thienyl; and said substituents on the phenyl moiety being selected from the group consisting of lower alkyl and halogen.

27. A 4-amino-1,2,5,6-tetrahydro-l-substituted arsenin-3-carbonitrile corresponding to the formula wherein R in the formula is a member selected from the group consisting of alkyl C C substituted and unsubstituted; phenyl, substituted and unsubstituted; said substituents on the alkyl moiety being selected from the group consisting of hydroxy, lower alkoxy, amino, pyridyl, furyl, thienyl and phenyl; and said substituents on the phenyl moiety being selected from the group consisting of lower alkyl and halogen.

28. 4 amino 1,2,5,6 tetrahydro 1 methylarscnin- S- carbonitrile.

29. 4 amino 1,2,5,6 tetrahydro 1 amylarsenin- 3-carbonitrile.

30. 4 amino 1,2,S,6 tetrahydro I (2' methoxyethyl) arsenin-3 -carbonitrile.

31. 4 amino l,2,5,6 tetrahydro 1 phenylarsenin- 3-carbonitrile.

32. 4 amino 1,2,5,6 tetrahydro 1 (4' aminophenyl) arsenin-3-carbonitrile.

33. A method of preparing a cyclic l-substituted phosphoridin-one which comprises cyclizin g a bis(2-cyanoethyl) substituted phosphine of the formula (CNCH CII MIF R R in each of the above formulae being a member selected from the group consisting of alkyl C -C substituted and unsubstituted; phenyl, substituted and unsubstituted; said substituents on the alkyl moiety being selected from the group consisting of hydroxy, lower alkoxy, amino, pyridy], furyl, thienyl and phenyl; and said substituents on the phenyl moiety being selected from the group consisting of lower alkyl and halogen.

Middleton Apr. 30, 1957 Thesing Get. 20, 1959 

26. A NOVEL CYCLIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF 4 - AMINO - 1,2,5,6-TETRAHYDROL-1-TETRAHYDROPHOSPHORN-3-CARBONITRILE AND 4-AMINO-1,2,5,6-TETRAHYDRO1-SUBSTITUTED ARSENIN-3-CARBONITRILE CORRESPONDING TO THE FORMULA 